/Engine/Source/Runtime/GeometryCore/Public/Spatial/BlockedDenseGrid3.h
a references to the specified block, this will allocate the block if it doesn't already exists.
[BlockData3Type](API\Runtime\GeometryCore\Spatial\TBasicBlockedDenseGrid3\BlockData3Type) & TouchBlockData ( const [FVector3i](API\Runtime\GeometryCore\FVector3i) & BlockIJK )